This product is great when it works properly. I originally purchased 2 of them to take with me on a camping trip. I checked the one to see how it worked prior to leaving for my trip, they were identical so I trusted that the other one would work the same. Much to my disappointment, the other one was not in working order. I was stuck in the middle of nowhere and with only 1 working head lamp. So I used it to it's fullest and as soon as I got home I placed another order for a replacement. Now I have 2 working headlamps and couldn't be happier...Advice: make sure your headlamp works properly before your return time expires or you will get to pay twice for the same product.....